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|
#
# Shm.pl: Shared Memory stuff.
# Author: dms
# Version: 20000201
# Created: 20000124
#
if (&IsParam("useStrict")) { use strict; }
use POSIX qw(_exit);
sub openSHM {
my $IPC_PRIVATE = 0;
my $size = 2000;
if (defined( $_ = shmget($IPC_PRIVATE, $size, 0777) )) {
&status("Created shared memory (shm) key: [$_]");
return $_;
} else {
&ERROR("openSHM: failed.");
&ERROR("Please delete some shared memory with ipcs or ipcrm.");
exit 1;
}
}
sub closeSHM {
my ($key) = @_;
my $IPC_RMID = 0;
return '' if (!defined $key);
&shmFlush();
&status("Closed shared memory (shm) key: [$key]");
return shmctl($key, $IPC_RMID, 0);
}
sub shmRead {
my ($key) = @_;
my $position = 0;
my $size = 3*80;
my $retval = '';
if (shmread($key,$retval,$position,$size)) {
return $retval;
} else {
&ERROR("shmRead: failed: $!");
### TODO: if this fails, never try again.
&openSHM();
return '';
}
}
sub shmWrite {
my ($key, $str) = @_;
my $position = 0;
my $size = 80*3;
# NULL hack.
### TODO: create shmClear to deal with this.
if ($str !~ /^$/) {
my $read = &shmRead($key);
$read =~ s/\0+//g;
if ($str eq "") {
$str = time().": "; # time stamping, null.
} elsif ($read eq "") {
$str = time().": "; # timestamping.
} else {
$str = $read ."||". $str;
}
}
if (!shmwrite($key,$str,$position,$size)) {
&ERROR("shmWrite: failed: $!");
}
}
##############
### Helpers
###
# Usage: &addForked($name);
# Return: 1 for success, 0 for failure.
sub addForked {
my ($name) = @_;
my $forker_timeout = 360; # 6mins, in seconds.
$forker = $name;
if (!defined $name) {
&WARN("addForked: name == NULL.");
return 0;
}
foreach (keys %forked) {
my $time = time() - $forked{$_}{Time};
next unless ($time > $forker_timeout);
### TODO: use &time2string()?
&WARN("Fork: looks like we lost '$_', executed $time ago.");
delete $forked{$_};
}
my $count = 0;
while (scalar keys %forked > 1) { # 2 or more == fail.
sleep 1;
if ($count > 3) { # 3 seconds.
my $list = join(', ', keys %forked);
if (defined $who) {
&msg($who, "already running ($list) => exceeded allowed forked processes count (1?).");
} else {
&status("Fork: I ran too many forked processes :) Giving up $name.");
}
return 0;
}
$count++;
}
if (exists $forked{$name} and !scalar keys %{ $forked{$name} }) {
&WARN("addF: forked{$name} exists but is empty; deleting.");
undef $forked{$name};
}
if (exists $forked{$name} and scalar keys %{ $forked{$name} }) {
my $time = $forked{$name}{Time};
my $continue = 0;
$continue++ if ($forked{$name}{PID} == $$);
if ($continue) {
&WARN("hrm.. fork pid == mypid == $$; how did this happen?");
} elsif ( -d "/proc/$forked{$name}{PID}") {
&status("fork: still running; good. BAIL OUT.");
return 0;
} else {
&WARN("Found dead fork; removing and resetting.");
$continue = 1;
}
if ($continue) {
# NOTHING.
} elsif (time() - $time > 900) { # stale fork > 15m.
&status("forked: forked{$name} presumably exited without notifying us.");
} else { # fresh fork.
&msg($who, "$name is already running ". &Time2String(time() - $time));
return 0;
}
}
$forked{$name}{Time} = time();
$forked{$name}{PID} = $$;
$forkedtime = time();
$count{'Fork'}++;
return 1;
}
sub delForked {
my ($name) = @_;
return if ($$ == $bot_pid);
if (!defined $name) {
&WARN("delForked: name == NULL.");
POSIX::_exit(0);
}
if ($name =~ /\.pl/) {
&WARN("dF: name is name of source file ($name). FIX IT!");
}
&showProc(); # just for informational purposes.
if (exists $forked{$name}) {
my $timestr = &Time2String(time() - $forked{$name}{Time});
&status("fork: took $timestr for $name.");
&shmWrite($shm,"DELETE FORK $name");
} else {
&ERROR("delForked: forked{$name} does not exist. should not happen.");
}
&status("--- fork finished for '$name' ---");
POSIX::_exit(0);
}
1;
|
